Walter 6839106 Turning Insert CCMT120408-RM4 WSM20S Carbide

Product Description

The WALTER 6839106 is a CCMT-style indexable turning insert designed for precision metal removal in CNC lathe and turning center applications. It carries the ISO designation CCMT120408-RM4 WSM20S and features a multilayer PVD coating of TiCN, Al2O3, and Al over a carbide substrate. The 80-degree diamond insert shape delivers a strong cutting edge with a 7-degree relief angle and a 12-degree positive rake angle. The RM4 chip breaker geometry is engineered to control chip flow and reduce heat buildup during interrupted and continuous cuts. This insert is suited for turning, facing, and boring operations and is typically installed by CNC machinists and toolroom technicians.

This insert is primarily intended for machining stainless steel and superalloys including titanium, with secondary suitability for general steel applications. It fits the ISO material grade designations M20, S20, and P20. The neutral hand orientation makes it compatible with standard right-hand and left-hand toolholders designed for CCMT-style inserts. The RM4 chip breaker geometry is well matched to medium-depth finishing and semi-finishing passes where consistent chip evacuation is critical.

Key Features

• PVD-applied TiCN, Al2O3, and Al multilayer coating for heat and wear resistance in difficult-to-machine materials
• 80-degree diamond insert shape with 0.80 mm corner radius for balance between edge strength and surface finish
• Positive rake angle of 12 degrees reduces cutting forces on stainless steel and titanium
• RM4 chip breaker geometry supports turning, facing, and boring in a single insert style
• Screw-lock insert holding method ensures secure seating and repeatable indexing
• Two cutting edges per insert; chamfered and honed cutting edge style for edge stability

Compatibility

Designed for use in CCMT-style screw-lock toolholders accepting a size 432 insert. Compatible with toolholders conforming to ANSI and ISO standards for CCMT120408 inserts. Verify toolholder pocket geometry and screw thread before installation.

Installation Notes

Installation is performed by CNC machinists or toolroom technicians using the appropriate Torx or hex key for the insert clamping screw. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully into the pocket and confirm the screw is snug before resuming any cutting operation. Inspect the pocket for wear, debris, or damage each time the insert is indexed.